Sinobakr has been dedicated to industrial precision cleaning for 26 years, specializing in integrated cleaning solutions for aluminum alloy die-cast housings widely used in new energy vehicles, servo motors, transmissions and automotive chassis components. We tackle typical cleaning difficulties including residual release agents, cutting fluids, aluminum swarf, embedded debris in inner cavities, threaded holes, blind holes and cooling ribs. Three tailored technological routes are available for small-batch trial runs, automated mass-production lines and ultra-high-cleanliness automotive-grade die-cast parts, along with customized equipment, dedicated tooling fixtures and full cleanliness testing delivery servicessinobakr.c....
1. Core Cleaning Challenges of Die-Cast Housings
Most die-cast housings adopt aluminum alloy die-casting molding. After casting and CNC machining, typical contaminants include die-casting release agent carbon deposits, emulsified cutting oil, anti-rust oil, fine aluminum chips, burrs and surface oxide stains. Substandard cleaning will trigger the following quality issues:
Residual grease deteriorates insulation performance, causing motor leakage, short circuits and abnormal operation noise;
Chips trapped in holes jam assembly and lead to dimensional deviation and sealing failure;
Residual moisture causes aluminum surface whitening, oxidation corrosion and watermark stains;
Poor surface adhesion for subsequent painting, coating and adhesive bonding, resulting in paint peeling.
Traditional manual air blowing and simple water washing cannot satisfy the ISO 16232 automotive component cleanliness standard required by mainstream vehicle manufacturerssinobakr.c....
2. Three Mainstream Cleaning Process Solutions from Sinobakr
Solution 1: Fully Enclosed Vacuum Hydrocarbon Cleaning (Premium High-End Option, EV Main Drive Motor/Transmission Housing Standard Process)
Applicable Scenarios: New energy vehicle drive motor housings, transmission casings, high-precision servo motor die-cast shells; complex multi-cavity structures with numerous blind/deep holes; applications requiring zero residue, no watermarks and strict cleanliness control before assembly.
Core Equipment: BK-CH Series Vacuum Ultrasonic Hydrocarbon Cleaning System (Multi-Station Integrated Unit)
Integrated functions: ultrasonic immersion cleaning, rotary high-pressure spraying, vacuum vapor degreasing, dual-solvent cascade rinsing, closed vacuum drying, and solvent distillation regeneration closed-loop system.
Fully Automatic PLC One-Click Technological Flow
Preprocessing: Workpiece loading and fixture positioning → 0.4 MPa compressed air purging to remove bulky aluminum chips and reduce the load of main cleaning procedures
Vacuum Ultrasonic Main Cleaning: Modified eco-friendly hydrocarbon solvent, operating temperature 55~70°C, 40 kHz ultrasonic cavitation. Negative vacuum greatly boosts solvent permeability to strip grease and micro aluminum debris from threads, deep holes and tiny gaps; cleaning duration: 3–6 minutes
Primary Fresh Solvent Overflow Rinsing: Remove contaminants carried over from the main cleaning stage
Precision Vacuum Vapor Rinsing: Solvent vapor infiltration under vacuum eliminates micro-residues in hidden gaps
Oxygen-Free Closed Vacuum Drying: Complete moisture removal without watermarks, preventing aluminum alloy oxidation and surface whitening
Workpiece Unloading & Random Cleanliness Sampling Inspection
Core Advantages
Outstanding Cleanliness: Particle contaminants ≤200 μm, residual oil content ＜30 mg/㎡, fully compliant with automotive-grade stringent standards; no blind cleaning zones inside cavities and holes
Safe & Eco-Friendly: Low-VOC, non-toxic, odorless hydrocarbon solvent; fully enclosed explosion-proof vacuum design eliminates open flame hazards; solvent distillation recovery rate ≥98%, drastically cutting long-term consumable costs
Aluminum Material Friendly: No corrosion, darkening, dullness or discoloration on die-cast aluminum; compatible with cast iron housings as well
Zero wastewater discharge; seamlessly connected to automated production lines to realize unmanned intelligent operation
Solution 2: Water-Based Automatic Ultrasonic Spray Cleaning Line (Cost-Effective Mass Production Scheme for General Die-Cast Housings)
Applicable Scenarios: Standard-structured motor outer shells, appearance-focused die-cast parts with medium cleanliness requirements, large daily output and limited factory procurement budget.
Technological Flow
Loading → High-pressure rough spraying (30~50 bar to flush heavy surface grease and aluminum scraps) → Precision ultrasonic cleaning with special aluminum-friendly water-based detergent → Two-stage deionized water rinsing → Air knife water stripping → Hot air drying → Unloading
Cleaning Agent: Sinobakr neutral water-based degreaser exclusively formulated for aluminum alloys, weakly alkaline formula added with aluminum corrosion inhibitors to avoid aluminum oxidation and blackening; diluted 5–15 times for use, working temperature: 50~65°C
Pros & Cons
✅ Lower equipment investment and consumable costs; ultra-high single-machine throughput, ideal for daily output above 3,000 pieces❌ Slightly weaker effect on removing micro-debris inside deep blind holes compared with hydrocarbon cleaning; improper drying easily generates watermarks and aluminum oxidation; supporting wastewater treatment facilities are required
Solution 3: Patented Rotary Spray Single Cleaning Machine (For Small & Medium Batch Die-Cast Housing Production)
Sinobakr independently developed patented rotary spray cleaning equipment (Patent No.: CN121485396A). Workpieces are clamped by dedicated fixtures and rotate at a constant speed, with multi-directional surrounding nozzles delivering 360° all-round flushing to thoroughly clean outer surfaces, cavities and threaded holes. Compact footprint, flexible operation, suitable for medium and small-scale die-cast housing manufacturers with moderate cleanliness demands.
Supplementary Value-Added Services
Sinobakr owns a professional cleanliness testing laboratory, providing third-party cleanliness detection and formal test reports; we also offer one-stop consignment cleaning services for customers without dedicated cleaning workshops
